I bought this Transcend 16GB SDHC card to use with a Canon 90-IS camera. This capacity allows me to take 3 or 4 hours of video on the camera as well as 5-600 photographs, or alternately, in excess of 10,000 photographs, depending on the `quality' settings I choose on the camera. This card is as fast as they get (Class 6) and very reliable, as all my other Transcend cards have been - some of which are now several years old and still working flawlessly.
As other reviewers have said, it is important to check in your manuals and manufacturers websites to see if your device is compatible with these High Capacity cards as they are a relatively new classification - e.g. one of my `older' cameras (four years old) can only use a standard SD card up to a maximum of 2GB and so a 16GB SDHC card is very obviously not readable by that device.
The seller I chose supplies this card in a blister pack with a card case and an SDHC card reader included for £26. I didn't strictly need the card reader, but at this price it's pretty much free and I've found it very useful for uploading documents and images from this card onto `older' PC's that can't read the High Capacity cards.
All in all, this is a high quality card with a huge capacity, which is reliable, fast and represents genuine value for money from a well-established company - and as all Transcend cards come with a lifetime warranty you can't really go wrong. My opinion would be to buy with confidence.
In reply to questions by other reviewers, a Gigabyte is a discrete amount of memory (i.e. not exactly 1,000 megabytes) and the industry `doubles up' this amount for our convenience and so as not to confuse us i.e. 2, 4, 8, 16, 32GB. An `8GB' card's actual capacity is approx. 7.5GB and a `16GB' card's capacity is approx. 14.9 GB and so on... much like a 1761 c.c. car engine is classed as a `1.8'
I hope all this has been of some use!